/*
 * Copyright (c) 2002-2021 "Neo4j,"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.neo4j.ogm.session.request.strategy.impl;

import org.neo4j.ogm.session.request.strategy.LoadClauseBuilder;

/**
 * Path based load clause for nodes - starts from given node variable
 *
 * @author Frantisek Hartman
 */
public class PathNodeLoadClauseBuilder implements LoadClauseBuilder {

    @Override
    public String build(String variable, String label, int depth) {
        if (depth < 0) {
            return " MATCH p=(" + variable + ")-[*0..]-(m) RETURN p";
        } else if (depth > 0) {
            return " MATCH p=(" + variable + ")-[*0.." + depth + "]-(m) RETURN p";
        } else {
            return " RETURN " + variable;
        }
    }
}
